Usually the gas ones are illegal in cities — on both sidewalks and streets but since you live in the country, I would think from reading the specs, that the XG505 for $339 — only $40 more than the basic model is the real deal, and may be the top of the line for that category. Isn’t it only 50 lbs. — just slightly more than the heavy cruiser bicycles.
You’re right that the electric models have trouble over hilly all-terrain conditions but the gas-powered ones, and this one is self-described as at least twice the performer for only 15% more seems to be the standout winner.
At this low-end, quality counts a lot. I’d pay $350 for top of the line anything.
By virtue of Mike’s link, and a few hours of internet crosschecking, I just picked up the X-treme XG-470 for $279, including the shipping. 50 lbs and foldable (supposedly). Wanted a full electric, but I live in a land of rain and hills.
My job is only a mile and a half away, and, since it’s under 50 cc, in my state, no motorcycle endorsement is required.
http://www.advancedelectricscooters.com/